speak with one voice

to express the same opinion It is a very rare event when my family speaks with one voice about anything.

Usage notes: must refer to two or more people, as in the example

Name	Pronounced	Usage
Dalia (2)	-	Lithuanian, Baltic Mythology
Siena	see-EN-ə	English (Modern)
Emilia	e-MEEL-yah (Italian, Spanish, Polish), E-mee-lee-ah (Finnish), e-MEE-lee-ah (Swedish)	Italian, Spanish, Romanian, Finnish, Polish, Swedish, Norwegian, Danish, English
Breeshey	BREE-shə	Manx
Raju	-	Indian, Hindi, Telugu, Tamil, Malayalam, Nepali
Tito	TEE-to (Italian, Spanish)	Italian, Spanish, Portuguese